>calladus wrote:

> I'm also interested in connecting PICS in a network environment.  I
> would like to use a Hub based environment using the RS-422 protocol, but
> I haven't found the protocol standard yet.  Anyone have any ideas on
> where to find these protocols?  I've heard that they must be purchased.
>

RS-422 is an EIA standard for the " Electrical Characteistics of Balanced
Voltage Digital Interface Circuits".  A standard for the signal
levels, impedances, protection,  etc. It can be used with any
protocol or digital signal.   RS-449 may be more help to you  it
covers  37 pin and 9 pin connectors, pinouts and other interface
items for serial binary data.  If you want to get a copy it is available from,

The Electronic Industries Association
2001 Eye Street
Washington, D.C 20006

Ben
---
C. Ben Allgor, PE
Benjamin Engineering Consultants
http://members.aol.com/bengineers